Anolis OS update for libarchive



| Updated: 2025-03-28
Risk Medium
Patch available YES
Number of vulnerabilities 3
CVE-ID CVE-2021-23177
CVE-2021-31566
CVE-2019-19221
CWE-ID CWE-61
CWE-125
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Anolis OS
Operating systems & Components / Operating system

libarchive
Operating systems & Components / Operating system package or component

bsdtar
Operating systems & Components / Operating system package or component

Vendor OpenAnolis

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) UNIX symbolic link following

EUVDB-ID: #VU61393

Risk: Low

CVSSv4.0: 4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-23177

CWE-ID: CWE-61 - UNIX Symbolic Link (Symlink) Following

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a symlink following issue when extracting files from archive, which can lean to changing ACLs of the target of the link. A local user can create a specially crafted archive, trick the victim into extracting files from it and escalate privileges on the system.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Anolis OS: 8

libarchive: before 3.3.3-3.0.1

bsdtar: before 3.3.3-3.0.1

CPE2.3 External links

https://anas.openanolis.cn/errata/detail/ANSA-2022:0082


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) UNIX symbolic link following

EUVDB-ID: #VU61394

Risk: Low

CVSSv4.0: 4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-31566

CWE-ID: CWE-61 - UNIX Symbolic Link (Symlink) Following

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a symlink following issue when extracting files from the archive. A local user can create a specially crafted symbolic link to a critical file on the system, place it into an archive and modify modes, times, access control lists, and flags of a file outside of the archive.


Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Anolis OS: 8

libarchive: before 3.3.3-3.0.1

bsdtar: before 3.3.3-3.0.1

CPE2.3 External links

https://anas.openanolis.cn/errata/detail/ANSA-2022:0082


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

3) Out-of-bounds read

EUVDB-ID: #VU22931

Risk: Medium

CVSSv4.0: 1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-19221

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition in "archive_wstring_append_from_mbs" in "archive_string.c" because of an incorrect "mbrtowc" or "mbtowc" call. A remote attacker can create a specially crafted archive file, trick the victim into opening it, trigger out-of-bounds read error and read contents of memory on the system.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

Anolis OS: 8

libarchive: before 3.3.3-3.0.1

bsdtar: before 3.3.3-3.0.1

CPE2.3 External links

https://anas.openanolis.cn/errata/detail/ANSA-2022:0082


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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